Valve seat grinding implement



s; H. HAAs 2,203,142

VALVE SEAT GRINDING IMPLEMENT Filed Feb. 2.3, 19:.59

fw 29 25? 21"# A idf Patented June 4, 1940 tif UNITED STATES PATENTOF'FlCE y 2,203,142 l VALVE SEAT GRINDI'NG `IMPLEMENT K Samuel H. Haas,Los Angeles, Calif. Application February 23, 1939, Serial No. 257,807

`1 Claim. r(Cl. 51-24i) My invention relates generally to grindingdevices and more particularly to a tool or implement for grinding theseats for the valves of internal combustion engines.

Among the principal objects of my invention are, to generally improveupon andvsimplify the construction of the existing forms of valve seatgrindings, to provide an improved grinder of the character referred tothat is of simple and compact construction, capable of being readilymanipulated when applied to or removed from the valve seat and theadjacent parts of the cylinder block and further, to provide a valveseat grinder that is especially applicable for use in use in connectionwith fluid pressure operated motors that impart oscillating rotarymotion to a shaft or other member to which the valve seat grinding toolis detachably connected.

Further objects of my invention are, to provide a Valve seat grindingimplement that utilizes as an abrasive member, a solid disc-like bodycomposed of powdered or pulverized abrasive metal, further, to providean improved driving element between the oscillating shaft and the iabrasive body and further, to provide a relatively simple and effectiveuniversal joint between the grinding tool and the motor driven shaft sothat the stem andthe grinding Wheel carried thereby will rotate on adefinite axis, even though the motor that drives the grinding wheeloccupies an out-of -line position with the axis of said stem andgrinding wheel.

With the foregoing and other objects in View, my invention consists incertain novel features of construction and arrangement of parts thatwill be hereinafter more fully described and claimed and illustrated inthe accompanying drawing in which:

Fig. 1 is a side elevational view of a valve seat Fig. is a crosssection taken on the line 5-5 of Fig. 3.

Referring by numerals vto the accompanying drawing which illustrates apreferred embodiment of my invention, l0 designates a conventional fluidpressure motor of the type that imparts oscillating rotary motion to itsshaft ll and, detachably connected to the end of the motor shaft,preferably by means of a pin i2, is the upper flat portion i3 of a link,for instance, a flat plate I4, the lower portion i5 of which is disposedat right angles-to the upper portion i3. The upper porti'oni3 of thislink is notched to provide a pair of spaced shoulders l5 that functionas stops to limit the pivotal or swinging movement between shaft il andplate I4. Likewise, the lower end of the lower portion Il5 of plate i4is notched to form a pairy ofr spaced shoulders l5. The lower portion l5of link I4 enters al slot that is formed in the upper end of a stem 'land, passing through said stem to the sides of the slot therein andthrough the lower portion l5 of plate i4 is a connecting member i8,preferably a pin similar to pin l2. The shoulders I6 function as stopsto limit relative swinging or pivotal movement 'between the stem il' andlower portion l5 of the plate or link i4.

As a result of the construction just described, plate or link I4functions as a universal joint between shaft H and stem il, thusenabling the motor and its shaft to function properly and drive stem il,even though the axes ofk said shaft and stem are not in alignment.

A short distance below the upper end of stem il, the latter is providedwith an external thread is adapted to enter the bearings that are formedin the cylinder blocks of engines below the valve seats thereof.

Removably positioned on flange 20 is a driving washer that comprises adisc 22, in the center of which is formed a non-circular opening 23 andwhich opening accommodates the correspondingly shaped portion of stem l1immediately above flange 20.

Formed integral with and projecting upwardly from the marginal edge ofdisc 22 is a plurality of inclined fingers 24, having upwardly andoutwardly inclined outer faces 25 and transversely curved inner faces26. The lower inner portions of these lingers 24 extend upwardly fromthe upper surface of disc 22 adjacent its -marginal edge, as illustratedin Figs. 3 and 4. As illustrated in Fig. 3, the thickness of the fingers24 gradually decreases toward their upper ends, the purpose of whichconstruction will be hereinafter set forth.

Removably positioned on the driving Washer 22 is a grinding wheel ordisc 21, preferably of the type composed of pulverized abrasivematerial, the lower portion of which disc is provided with a beveledsurface 28 and, formed in said beveled surface is a series of radiallydisposed grooves 29, the number of which grooves corresponds with thenumber of fingers 24 on the driving disc.

Grooves 29 are practically semi-circular in cross section in order toreceive the curved inner faces 26 of the fingers 24 and, the thicknessof the fingers and the gradual taper thereof toward their upper endspermit said iingers to lie entirely below the inclined surface 28 of thegrinding disc, so that said fingers do not contact with the valve seatwhile the disc is in grinding engagement therewith.

The driving washer 22 is clamped against the top of flange 20 and thegrinding disc is clamped against said driving washer by means of a nut30 that is mounted on the threaded portion 29 of the stem and, said nutbearing on a washer 3| that bears directly on top of the grinding discaround the stem l1.

In the use of my improved valve seat grinding implement, the pilotportion 2l of the stem is inserted through the valve stem bearing in thecylinder block and, the stem connected by the universal joint member tothe motor shaft Il is lowered until the inclined face 23 of the grindingdisc engages the valve seat. Motor l0 operates to impart oscillatingrotary motion to shaft li and such motion is imparted to stem I1 and thegrinding disc carried thereby, so that the latter engages and grinds thevalve seat to the desired degree.

It has been demonstrated in practice that by imparting oscillatingrotary mo-tion to the grinding disc, a much smoother and more evenly1inished surface is produced on the valve seat than where the grindingis continuously rotated in one direction.

The driving washer 22 provides a simple and eiiicient connection betweenthe stem and the grinding disc and, as the outer faces of the fingers2r?, are positioned beneath the inclined face 28 of the grinding disc,there is no metal to metal contact between the grinder and the valveseat that is being ground.

The universal joint member id provides a simple and effective connectionbetween the motor shaft and the upper end of the stem of the valve seatgrinder and permits the grinder to function properly, even though theshaft of thek motor is out of alignment with the axis of the v grinderstem. Obviously, member i4 may be utilized as a simple and effectiveuniversal joint between any two shafts.

Grinding wheels or discs of different sizes may be interchangeably usedon the stem of the grinding tool and with the driving washer that iscarried thereby.

Thus it will Vbe seen that I have provided a valve seat grindingimplement that is relatively simple in construction, inexpensive ofmanufacture, and very eifective in performing the functions for which itis intended.

It will be understood that minor changes in the size, form andconstruction of the various parts of my improved valve seat grindingimplement, may be made and substituted for those herein shown anddescribed, without departing from the spirit of my invention, the scopevof which is set forth in the appended claim.

I claim as my invention:

In a valve seat grinding implement, a stem, a shoulder formed thereon, adriving Washer carried by said stern and lpositioned upon said shouldera portion of the stem immediately above the shoulder thereon beingnon-circular in cross section and said driving washer being providedwith a non-circular opening that receives the non-circular portion ofthe stem to provide a driving engagement between the stem and washer,fingers projecting upwardly and outwardly from said driving washer, agrinding disc composed of a solid body of abrasive material positionedon said stem and resting on said driving washer, said disc beingprovidedv with grooves for the reception of the fingers on said drivingwasher, the depth of which grooves is greater than the thickness of saidfingers so that the outer faces of said fingers when positioned in saidgrooves are disposed below the grinding surface of said disc and meansfor clamping said disc and driving washer to said stem.

SAMUEL H. HAAS.

